Winners of Nasa's Let It Snow photography contest

Snowflakes, by Brian Johnson. Kechi, Kansas. He says: "Macro photo of snowflakes on a Carhartt coat. Taken with Cannon Powershot A720. Sitting on the back porch watching a very light snow fall. I was interested in macrophotography and wondered if I could see the actual snowflake crystals. My first attempt was wearing a black jacket that didn't show the snowflakes very well. Then I grabbed my Carhartt jacket and watched the snow gather on my arm."Picture: Brian Johnson/NASA/Rex Features